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Presidential Christmas

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Christmas decorations are seen in the Cross Hall and Blue Room of the White House on December 2 in Washington, D.C. Brian Cassella/Chicago Tribune/MCT/Newscom

First Lady Michelle Obama reads 'The Night Before Christmas' at the National Christmas Tree Lighting ceremony on the Ellipse near the White House in Washington on December 3. Dennis Brack/Pool/UPI/Newscom

The National Christmas Tree is seen being lit by President Barack Obama on the Ellipse on December 3.

Jewel Samad/AFP/Newscom

The Reception Room is decorated for Christmas during a preview of the holiday season decorations at the White House on December 2. Olivier Douliery/Abaca Press/MCT/Newscom

President Reagan with First Lady Nancy Reagan and their dog Rex are seen on the South Lawn during a ceremony to light the National Christmas Tree on December 12, 1985. Reagan Library/Three Trees Photos/Newscom

President Jimmy Carter and his daughter Amy celebrate Christmas. Zuma/Newscom

President Gerald Ford waves to the crowd at the lighting of the National Christmas Tree in 1976. Newscom

President John F. Kennedy and First Lady Jacqueline Kennedy stand by the White House Christmas Tree in the Blue Room of the White House on December 13, 1961. Robert Knudsen/JFK Library/UPI/Newscom

A holiday tree ornament featuring former President Theodore Roosevelt hangs on a Fraser Fir in the Blue Room in 2008. Karen Bleier/AFP/Newscom

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The airstrikes have targeted at least nine of Yemen's 21 provinces and have prevented the Houthis from reaching Aden, the former capital of the once-independent south.

ByAhmed Al-Haj, Associated PressMarch 30, 2015

Hani Mohammed/AP

Saudi-led naval forces imposed a blockade on Yemen's ports as coalition airstrikes on Monday repelled an advance on the southern port city of Aden by Shiite rebels and forces loyal to a former president.